“Ala de javascript” Código de respuesta

¿Por qué JavaScript tiene alza?

// why does javascript have hoisting?

As Stoyan Stefanov explains in "JavaScript Patterns" book, the hoisting is 
result of JavaScript interpreter implementation.

The JS code interpretation is performed in two passes. 
a) During the first pass, the interpreter processes 
variable[NOT the initialitations] and function declarations.

b)The second pass is the actual code execution step. The interpreter processes 
function expressions and undeclared variables.

Thus, we can use the "hoisting" concept to describe such behavior.
Smiling Starling

Alzando en JavaScript

// hoisting is as if your `function fun() {}` was located here. 

fun(); // works. 

function fun() {}
madhav

Ala de javascript

hoistedVariable = 3;
console.log(hoistedVariable); // outputs 3 even when the variable is declared after it is initialized	
var hoistedVariable;
Grotesque Gorilla

Ala de javascript

x = 5; // Assign 5 to x

elem = document.getElementById("demo"); // Find an element
elem.innerHTML = x;                     // Display x in the element

var x; // Declare x
naly moslih

Ala de javascript

// accessing class
const p = new Person(); // ReferenceError

// defining class
class Person {
  constructor(name) {
    this.name = name;
  }
}
SAMER SAEID

Ala de javascript

/*
Hoisting in JavaScript is a behavior in which a function 
or a variable can be used before declaration
*/

// using test before declaring
console.log(test);   // undefined
var test;
Tiny Coders

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